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Renntech Stage 1 M157 tune in a 2012 CLS63 AMG runs 11.3@125

Low 11's with just a tune in warm 85 degree Florida weather? That is what a CLS63 AMG (non-Performance Package) with the Stage 1 Renntech M157 tune just did. The Stage I tune raises boost from the stock 14.5 psi to about the exact same amount as the performance package, 18.8 psi. The vehicle was completely stock except for Nitto NT05 drag radials. Density altitude was just under 2000 feet which means in winter conditions we can realistically expect high 10's out of tune only M157 cars.

This vehicle belonged to a customer so hard launches / launch control were not used as the 1.8 60 foot validates. This just the beginning of M157 performance tuning and things are off to quite a great beginning.

Yes... YES... YES!!! WOW! 11.3 tune only in FL DA with a 1.8 60'!!! Go RENNtech!! Sick times! Possible 10's with big neg DA with a TUNE only!! Throw on some skinny's with some 17's on the back and wow.... I dont want to bench race but damn... the potential is huge for this car.I have been flirting with getting this car for a while now and this just made it a whole lot easier for me. Anyone want to buy a C63? LOL

Yes... YES... YES!!! WOW! 11.3 tune only in FL DA with a 1.8 60'!!! Go RENNtech!! Sick times! Possible 10's with big neg DA with a TUNE only!! Throw on some skinny's with some 17's on the back and wow.... I dont want to bench race but damn... the potential is huge for this car.I have been flirting with getting this car for a while now and this just made it a whole lot easier for me. Anyone want to buy a C63? LOL

Obviously, the tune-only M157 is not "extensively modified" for the M157 platform. It may, however, be considered "heavily modified" (even though we're just talking a tune here) relative to other car platforms, when you look at the boost that it's pushing and the size/output of the engine.

Again, it's not heavily modified, but traditionally, cars that put out this much hp/tq are heavily modified. It just happens that the M157 is a monster in stock form.

Obviously, the tune-only M157 is not "extensively modified" for the M157 platform. It may, however, be considered "heavily modified" (even though we're just talking a tune here) relative to other car platforms, when you look at the boost that it's pushing and the size/output of the engine.

Again, it's not heavily modified, but traditionally, cars that put out this much hp/tq are heavily modified. It just happens that the M157 is a monster in stock form.

And thats 0 DA. Calculate for -1200 DA and watch the magic happen. Of course it would correct up but you would still be in the 10's.

This will be slightly faster than a PP E63 as this tune is more aggressive than the PP tune. The E63 is a little lighter as well...

I don't know... If the boost on this tuned CLS is comparable to the PP cars and given the E63 is hundreds of pounds lighter, I don't think this tuned CLS will be faster than a PP E 63 with the same drag setup as this CLS (i.e., DR's). E 63 should be faster.

Depends. If you mean manifold-back, then yes, most likely, because you could remove the cats. But if you mean just a catback, then probably not because the E63's stock catback is probably very high flowing.

I don't know... If the boost on this tuned CLS is comparable to the PP cars and given the E63 is hundreds of pounds lighter, I don't think this tuned CLS will be faster than a PP E 63 with the same drag setup as this CLS (i.e., DR's). E 63 should be faster.

If the cars have the same tune and setup the E will be faster due to its weight. The PP will be slower than a Stage I as Renntech as they already demonstrated they are gaining power on top of the PP.

Depends. If you mean manifold-back, then yes, most likely, because you could remove the cats. But if you mean just a catback, then probably not because the E63's stock catback is probably very high flowing.

If the cars have the same tune and setup the E will be faster due to its weight. The PP will be slower than a Stage I as Renntech already demonstrated they are gaining power on top of the PP.

I understand. And that power gain must come from increasing timing if boost is the same. I don't know the power difference off hand between the PP and the RT stage 1 tune, but the power difference would have to be more than 50 hp/tq (just throwing out a number) to compensate for the difference of several hundred pounds in weight disparity.

I understand. And that power gain must come from increasing timing if boost is the same. I don't know the power difference off hand between the PP and the RT stage 1 tune, but the power difference would have to be more than 50 hp/tq (just throwing out a number) to compensate for the difference of several hundred pounds in weight disparity.

"This Renntech tune maintains just about the same maximum boost pressure so the gains seem to be coming from more boost down low as well as adjusting the timing."

I'll still stick with my theory that a tune that increases hp by 20 and tq by 40 will not make up the difference of hundreds of pounds.

Of course, the proof will be in the actual track times. So we'll see when more time passes and more people get their new cars to the track.

That said, there are always variables and a RT stage 1 CLS can run quicker/faster than a PP E63, but if you compare the two cars in the same conditions (temp, DA, track prep, and drag setup (like tires), I believe the PP E63 will come out on top.